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Interesting stuff. I calculate the height taking into consideration the float of the rod. It is my view that the piston on the higher revving engines is retained by the rod. My engines all have alloy rods, so I think that the tdc of the piston in the engine cold and hot are about the same. In a...

Definitely an interesting thread. The MB40 with it's Jug handle mini motor bike port technology is an interesting engine. In saying that, the few that I have seen and run and did a power comparison on, while they did run well, had less torque and less power than the Nelson 40 F3D engine. The MB...

Peter Halman who used to make Irvine engines, has the same scallop cut on the exhaust side of the transfer port. He told me it improved flow and top end power. I have not tried that at all but will do for sure. Neil

Yes, there will be a slight increase in overall end play of the crankshaft in the engine. Also you will feel that the crank is not totally smooth smooth when rocked at BDC. It will often make a sound that is like a rumble. If the case is rested on an inverted stainless mixing bowl, you will be...

I know this is an old post. Do any photo's of your bearings? How were these created ? Thanks, Neil

The main reason some companies liners are different sizes, is because of the chroming process. So it becomes easier to hone a liner to a minimum clean up and then fit a piston and head as compared to the extra time in honing out a sleeve to a specific size. When honing a sleeve, the hone only...

I use cooking oil as a coolant, what ever is cheapest and thinnest seems to work well. As for fit and liner material, it all depends on the engine type and liner taper. With the 4032 F3D liners about 0.260 inches from the top of liner or about 0.07 inches BTDC. With the 2.5cc speed liners...

I am currently using a ccmw09t304 MD220 , it is a md220 grade pcd insert with w 0.4mm radius from Mitsubishi. Not sure what the USA designation is sorry. Mine is flat on top, but am looking at getting a positive top rake insert, but it requires another holder that I currently do not have. The...

My lathe I use for pistons is an old Myford Super7, but I have reground the spindle shaft, and blued the taper bearing to the reground spindle. Fitted new rear Angular contact bearing pair. In order to have the lathe at it's maximum concentricity, it can not run in the high gear mode. The heat...